Ext.define('yxt.model.ChatHis', {
	  extend: 'Ext.data.Model',
	  idProperty: 'chat_id',
	  fields: [
	           {name: 'chat_id', type: 'int'},
	           {name: 'user_id', type: 'string'},
	           {name: 'name', type: 'string'},
	           {name: 'text' , type: 'string'},
	           {name: 'chat_date', type: 'date',dateFormat:'time'}
	  ]
});